BEST WAY TO MAKE THIS?
BEST WAY TO MAKE THIS?
(OP)
So this is a cover for a small radiator for a computer. Now, I was wondering can this be made with a two cavity mold, basically, pull tom and bottom and side actions for front back? what about the lowest draft angle, as 5 degrees over 128mm distance changes the width too much from top to bottom, I need around .5 or 1. I know theres alternatives such as a front back mold, split in the middle and maybe ultrasonic weld or clip features, but would be nice in one mold.






RE: BEST WAY TO MAKE THIS?
For me, I would see no problem moulding it. Side cheeks, stripper plate ejection with some additional pins ejecting on the inside of the base. Commercial polish finish. 0.5 to 1 deg should be fine for the core. The outer faces can be of zero draft. Direct sprue feed onto base (or a hot tip).
You might get movement of the core, degree of which will depend on what you make it from. Cycle time likely to be extended due to limited cooling in the core (although it might be 3" thick?).
As an an aside - countersunk screw holes are not good in plastics. The wedging action cause by the inevitable line contact on the countersink will cause rapid creep, if not cracking.
Cheers
Harry
www.tynevalleyplastics.co.uk
It's ok to soar like an eagle, but weasels don't get sucked into jet engines.
RE: BEST WAY TO MAKE THIS?
RE: BEST WAY TO MAKE THIS?
Thanks Harry, great information.
RE: BEST WAY TO MAKE THIS?
RE: BEST WAY TO MAKE THIS?
H
www.tynevalleyplastics.co.uk
It's ok to soar like an eagle, but weasels don't get sucked into jet engines.
RE: BEST WAY TO MAKE THIS?
RE: BEST WAY TO MAKE THIS?
PC/ABS has minimal shrinkage as it's amorphous - there is only the thermal shrinkage. Sink marks are like warpage in glass-filed material: usually designed in. Your part looks ok. (You may get a witness of weld/flow lines around the holes).
You should add a small rad to the bottom inner face corners as well. Sharp corners not good....
H
www.tynevalleyplastics.co.uk
It's ok to soar like an eagle, but weasels don't get sucked into jet engines.
RE: BEST WAY TO MAKE THIS?